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'90 oil cooler question

Is the '90 oil filter head/oil cooler setup full flow to the cooler or is just a portion of the oil pump output channeled through the cooler? And I seem to remember reference to a thermostat that may control this?

I seem to remember reference to a thermostat that may control this?

Exactly! /ubbthreads/images/graemlins/wink.gif Its full flow when the oil temperature is high, closed at low temperatures, and somewhere in between full open or closed when the oil temperature is just right.


Turn Right Racing
Staff member
Mar 5, 2001
I was just examining mine this week, and it looks like the thermostatic valve closes off the return side of the flow.
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